Solved Quiz 9 for Microelectronic Circuits | ECE 3040, Quizzes of Electrical and Electronics Engineering

Download Solved Quiz 9 for Microelectronic Circuits | ECE 3040 and more Quizzes Electrical and Electronics Engineering in PDF only on Docsity! ECE 3040 Microelectronic Circuits Quiz 9 July 14, 2004 Professor Leach Name Instructions. Print your name in the space above. The quiz is closed-book and closed-notes. The quiz consists of one problem. Honor Code Statement: I have neither given nor received help on this quiz. Initials 1. It is given that V + = 18V, V − = −18V, IQ = 1mA, RB = 1kΩ, RE = RC/200, β = 99, r0 = ∞, and VT = 25mV. Solve for RC such that vo1 = −vo2 = −50 (vi1 − vi2). In the simplified T model of each BJT, r0e is given by r0e = RB 1 + β + 2VT IQ = 60Ω From the simplified T model circuit i0e1 = −i0e2 = vI1 − vI2 2 (r0e +RE) = vI1 − vI2 2 (r0e +RC/200) The two output voltages are given by vo1 = −v02 = −αi0e1RC = −αRC 2 (r0e +RC/200) (vI1 − vI2) = −50 (vi1 − vi2) It follows that αRC = 2× 50 µ r0e + RC 200 ¶ =⇒ (α− 0.5)RC = 100r0e =⇒ RC = 100r0e α− 0.5 = 12.24 kΩ 1